<?php

namespace Framework;
use PDO;

class Database {
    public $conn;
    /**
     * Database类构造器
     * @param arry $config
     */
    public function __construct($config) {
        $dsn = "mysql:host={$config['host']};
        port={$config['port']};
        dbname={$config['dbname']}";

        $options = [
            PDO::ATTR_AUTOCOMMIT => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ
        ];

        try {
            $this->conn = new PDO($dsn, $config['username'], $config['password'],$options); 
        } catch (\PDOException $e) {
            throw new \Exception("数据库连接失败：{$e->getMessage()}");
        }
    }
    /**
     * 执行数据库请求
     * @param string $query
     * @return PDOStatement
     * @throws PDOException
     */
    public function query($query,$params = []) {
        try {
            $sth = $this->conn->prepare($query);
           
            foreach ($params as $param => $value) {
                $sth->bindValue(':' . $param,$value);
            }
            $sth->execute();
            return $sth;
        } catch (\PDOException $e) {
            throw new \Exception("数据库请求执行失败：{$e -> getMessage()}");
        }
    }
}